A Franco-Italian war during the Spanish Civil War

How would a 1937 war between France and Italy develop if Britain initially stayed out?

The land war would probably become an Alpine stalemate, and Britain would remain neutral only while France continued to contain Italy at sea.

Italy enters the scenario strained by the Abyssinian campaign, while the Alpine frontier favours a fortress war. Such fighting could force changes in the French army and leave it better prepared for 1939. Italy's fleet is described as arguably more modernised than France's, giving the naval contest a different balance from the land campaign. Britain could remain outside the war while France continued to contain Italy at sea. If Italy gained the upper hand, increasingly forceful British neutrality patrols or intervention are expected to prevent a changed Mediterranean balance.